<template>
	<!-- 文件上传 -->
	<div class="upload-file">
		<el-upload ref="fileUploadRef" multiple :action="uploadFileUrl" :before-upload="handleBeforeUpload"
			:file-list="fileList" :limit="limit" :accept="fileAccept" :on-error="handleUploadError" :on-exceed="handleExceed"
			:on-success="handleUploadSuccess" :show-file-list="false" :headers="headers" class="upload-file-uploader"
			v-if="!disabled">
			<!-- 上传按钮 -->
			<el-button type="primary">选取文件</el-button>
		</el-upload>
		<!-- 上传提示 -->
		<div v-if="showTip && !disabled" class="el-upload__tip">
			请上传
			<template v-if="fileSize">
				大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
			</template>
			<template v-if="fileType">
				格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
			</template>
			的文件
		</div>
		<!-- 文件列表 -->
		<transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
			<li v-for="(file, index) in fileList" :key="file.uid" class="el-upload-list__item ele-upload-list__item-content">
				<el-link :href="`${file.url}`" :underline="false" target="_blank">
					<span class="el-icon-document"> {{ getFileName(file.name) }} </span>
				</el-link>
				<div class="ele-upload-list__item-content-action">
					<el-button type="danger" v-if="!disabled" link @click="handleDelete(index)">删除</el-button>
				</div>
			</li>
		</transition-group>
	</div>
</template>

<script setup>
import { propTypes } from '@/utils/propTypes';
import { delOss, listByIds } from '@/api/system/oss';
import { globalHeaders } from '@/utils/request';

const props = defineProps({
	modelValue: {
		type: [String, Object, Array],
		default: () => []
	},
	// 数量限制
	limit: propTypes.number.def(5),
	// 大小限制(MB)
	fileSize: propTypes.number.def(5),
	// 文件类型, 例如['png', 'jpg', 'jpeg']
	fileType: propTypes.array.def(['doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx', 'txt', 'pdf']),
	// 是否显示提示
	isShowTip: propTypes.bool.def(true),
	// 禁用组件（仅查看文件）
	disabled: propTypes.bool.def(false)
});

const { proxy } = getCurrentInstance()
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref([]);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadFileUrl = ref(baseUrl + '/resource/oss/upload'); // 上传文件服务器地址
const headers = ref(globalHeaders());

const fileList = ref([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

const fileUploadRef = ref();

// 监听 fileType 变化，更新 fileAccept
const fileAccept = computed(() => props.fileType.map((type) => `.${type}`).join(','));

watch(
	() => props.modelValue,
	async (val) => {
		if (val) {
			let temp = 1;
			// 首先将值转为数组
			let list = [];
			if (Array.isArray(val)) {
				list = val;
			} else {
				const res = await listByIds(val);
				list = res.data.map((oss) => {
					return {
						name: oss.originalName,
						url: oss.url,
						ossId: oss.ossId
					};
				});
			}
			// 然后将数组转为对象数组
			fileList.value = list.map((item) => {
				item = { name: item.name, url: item.url, ossId: item.ossId };
				item.uid = item.uid || new Date().getTime() + temp++;
				return item;
			});
		} else {
			fileList.value = [];
			return [];
		}
	},
	{ deep: true, immediate: true }
);

// 上传前校检格式和大小
const handleBeforeUpload = (file) => {
	// 校检文件类型
	if (props.fileType.length) {
		const fileName = file.name.split('.');
		const fileExt = fileName[fileName.length - 1];
		const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
		if (!isTypeOk) {
			proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}格式文件!`);
			return false;
		}
	}
	// 校检文件名是否包含特殊字符
	if (file.name.includes(',')) {
		proxy?.$modal.msgError('文件名不正确，不能包含英文逗号!');
		return false;
	}
	// 校检文件大小
	if (props.fileSize) {
		const isLt = file.size / 1024 / 1024 < props.fileSize;
		if (!isLt) {
			proxy?.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
			return false;
		}
	}
	proxy?.$modal.loading('正在上传文件，请稍候...');
	number.value++;
	return true;
};

// 文件个数超出
const handleExceed = () => {
	proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传失败
const handleUploadError = () => {
	proxy?.$modal.msgError('上传文件失败');
};

// 上传成功回调
const handleUploadSuccess = (res, file) => {
	if (res.code === 200) {
		uploadList.value.push({
			name: res.data.fileName,
			url: res.data.url,
			ossId: res.data.ossId
		});
		uploadedSuccessfully();
	} else {
		number.value--;
		proxy?.$modal.closeLoading();
		proxy?.$modal.msgError(res.msg);
		fileUploadRef.value?.handleRemove(file);
		uploadedSuccessfully();
	}
};

// 删除文件
const handleDelete = (index) => {
	const ossId = fileList.value[index].ossId;
	delOss(ossId);
	fileList.value.splice(index, 1);
	emit('update:modelValue', listToString(fileList.value));
};

// 上传结束处理
const uploadedSuccessfully = () => {
	if (number.value > 0 && uploadList.value.length === number.value) {
		fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
		uploadList.value = [];
		number.value = 0;
		emit('update:modelValue', listToString(fileList.value));
		proxy?.$modal.closeLoading();
	}
};

// 获取文件名称
const getFileName = (name) => {
	// 如果是url那么取最后的名字 如果不是直接返回
	if (name.lastIndexOf('/') > -1) {
		return name.slice(name.lastIndexOf('/') + 1);
	} else {
		return name;
	}
};

// 对象转成指定字符串分隔
const listToString = (list, separator) => {
	let strs = '';
	separator = separator || ',';
	list.forEach((item) => {
		if (item.ossId) {
			strs += item.ossId + separator;
		}
	});
	return strs != '' ? strs.substring(0, strs.length - 1) : '';
};
</script>

<style lang="scss" scoped>
.upload-file-uploader {
	margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
	border: 1px solid #e4e7ed;
	line-height: 2;
	margin-bottom: 10px;
	position: relative;
}

.upload-file-list .ele-upload-list__item-content {
	display: flex;
	justify-content: space-between;
	align-items: center;
	color: inherit;
}

.ele-upload-list__item-content-action .el-link {
	margin-right: 10px;
}
</style>
